[web] Fix filename typo

Summary:
For some reason I named the file w/ the WebEditThreadAvatarProvider as native-edit-thread-avatar-provider... this diff just fixes that.

Depends on D8841 (kind of)

Test Plan: NA/CI

Reviewers: ashoat, ginsu

Reviewed By: ginsu

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D8842